From the good nature rolling of the eyes Kale is doing, it's clearly he almost sort of finds Trever's reaction funny. In that "I'm going to strangle my brother later but I'm not going to do it right now because there's witnesses and I don't want to have to deal with getting rid of two bodies" sort of way. They have a very loving relationship.

"It's not quite like that," Kale said, glaring at his brother, "It's more like trying to tame an animal. It starts off not trusting you and I have to make it trust me. While it takes a bit longer than perhaps normal hacking, the upside of it is that I don't need to be at a terminal to access information and once she trusts me, she'll pretty much always trust me."